EDMONTON - At some point late Friday night, five G4S employees drove to HUB Mall on the University of Alberta campus to make a delivery. Now three are dead, one is critically injured, and one is wanted by police.

While the exact time of the shooting is still unclear, here’s a brief timeline of the events after.

12:30 a.m. — Students around the University of Alberta begin posting on Twitter about hearing sirens, a helicopter and loud banging. Some students report they are on a “lockdown.”

— Students in dorm rooms above the indoor shopping street hear a man screaming, and watch police break through a heavy door. They pull out the injured man and two bodies. Another victim’s body is found lying outside the building.

12:35 a.m. — Edmonton Journal cameras at the Eastgate printing plant record video of a blue G4S truck driving past. The truck is later found parked on the side of the road blocks away, just outside the G4S compound. Police request copies of the video.

12:48 a.m. —“Hi, I am in the basement of HUB and there is a shooter upstairs. Can you please tell me what is going on?”

About 1 a.m. — U of A provost Carl Amrhein gets a call from police regarding the shooting and mobilizes the university’s crisis management team.

1:20 a.m. — Police publicly confirm three people dead and a fourth victim is in critical condition.

1:33 a.m. — News of the shooting starts to dominate the Twitter conversation.cface fontname="Italic" naxe="0" iaxis="0"/>Journal reporter Mariam Ibrahim on scene, becomes the first shooting-related word to trend in Edmonton, followed shortly by HUB.

2:10 a.m. — Official U of A Twitter account posts: “#ualberta people are unharmed. HUB in lockdown — avoid the area.”

About 3 a.m. — Homicide detectives arrive and take over the investigation.

3:28 a.m. — U of A posts an emergency alert on its website: “Armoured car robbery on campus in HUB Mall. Edmonton police are on scene. Exams and other university operations are proceeding as regularly scheduled.”

6:49 a.m. — Reached in Toronto, G4S company spokeswoman Robin Steinberg says: “Nothing like this has happened before. I’ve been with G4S for five and a half years and nothing even close to this. This is just horrific.”

About 7 a.m. — U of A students are told they can leave HUB Mall, but can’t gain access again.

8:49 a.m. — Alberta Wildrose leader Danielle Smith posts the message: “My thoughts are with the families of the #UofA shooting victims. Hoping the fourth recovers and those responsible are caught.”

9:04 a.m. — Mayor Stephen Mandel sends his message by Twitter: “Condolences to everyone touched by the fatal robbery/shooting at #UAlberta. Our thoughts and prayers are with you. #yeg #senselesstragedy”

11:05 a.m. — Edmonton police release a photo of Travis Brandon Baumgartner, 21, and declare him a person of interest, asking the public to watch out for his dark blue For F-150 truck with licence number ZRE 724.

How it played out ... Timeline for the U of A shooting

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